A Single-Arm, Phase 2 Study of Neoadjuvant Carboplatin and Mirvetuximab Soravtansine in Subjects with FR alpha-Expressing Advanced-Stage Serous Epithelial Ovarian, Fallopian Tube or Primary Peritoneal Cancer

Inclusion Criteria: - Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1 - Be judged by the investigator and/or treating physician to be an appropriate candidate to receive neoadjuvant chemotherapy. - Diagnosis of biopsy-confirmed high-grade, serous epithelial ovarian, fallopian tube or primary peritoneal cancer. - Participant meets the following disease criteria: - Stage III or IV disease by the Fédération Internationale de Gynécologie et d'Obstétrique (FIGO) staging system, 27 and - Folate Receptor Alpha (FRα) expression positivity as defined by immunohistochemical staining of >= 75% of viable tumor cells with moderate (2+) and/or strong (3+) membrane staining by the AbbVie specified vendor with the Ventana Folate Receptor Alpha (FOLR1) assay, and - Measurable disease by Response Evaluation Criteria in Solid Tumors (RECIST) Version 1.1 criteria. Exclusion Criteria: - Endometrioid, clear cell, mucinous, or sarcomatous tumor histology; mixed tumors containing any of the above histologies; or low-grade/borderline ovarian tumor. - Previous clinical diagnosis of noninfectious interstitial lung disease, including noninfectious pneumonitis (exception: Grade 1 noninfectious pneumonitis diagnosed on or within 6 weeks after treatment with an immunotherapeutic agent that has resolved per investigator or resolution of the radiologic findings). - Previously treated with anticancer therapy including chemotherapy, radiation therapy, immunotherapy, or biologic agent for current cancer, with the exception of one cycle of single agent carboplatin - Participants with the following ocular history and/or concurrent disorders: - History of corneal transplantation; - Undergoing active postoperative management for refractive surgery, cataract surgery, corneal cross-linking, or corneal complications of surgery; - Confluent superficial punctate keratopathy (SPK) not expected to resolve to non-confluence or better within the screening window with standard of care (SOC) intervention; - Active or chronic clinically significant (>= Grade 3) corneal dystrophy (e.g., Fuchs dystrophy); - Active ocular conditions requiring ongoing treatment/monitoring, such as glaucoma, which is not adequately controlled with medication or surgery, wet age-related macular degeneration requiring intravitreal injections, active diabetic retinopathy with macular edema, macular degeneration, presence of papilledema or an ocular condition with high risk of retinal detachment; - Monocular vision with visual acuity in the worse eye, worse than 20/200 or visual fields less than 20 degrees (i.e., functional blindness in at least one eye). - History of other malignancy within 3 years prior to signing study consent. -- Note: Participants with tumors with a negligible risk for metastasis or death (e.g., adequately controlled basal-cell carcinoma or squamous-cell carcinoma of the skin, or carcinoma in situ of the cervix or breast) are eligible.